Wireless power transfer
(WPT) inside the MRI bore, as part of completely wireless patient coils, should
have minimal RF interactions and be a compact system that allows for flexible
placement of the coils while maintaining power transfer efficiency. Changes in coil positions can drastically
reduce power amplifier efficiency. Here
we present a MEMS based auto-tuning approach to compensate for the varying load
seen by the power amplifier. An array
primary coils also using high-power RF MEMS devices to steer power to a local
secondary coil is also demonstrated.

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